|Publication number||US7114496 B1|
|Application number||US 10/906,704|
|Publication date||Oct 3, 2006|
|Filing date||Mar 2, 2005|
|Priority date||Mar 2, 2005|
|Publication number||10906704, 906704, US 7114496 B1, US 7114496B1, US-B1-7114496, US7114496 B1, US7114496B1|
|Inventors||Todd A Resnick, Richard L Stein|
|Original Assignee||Tmr-D, Llc|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (10), Referenced by (12), Classifications (7), Legal Events (5)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This invention relates to a filter cartridge with integrated inhalation and exhalation valves that minimize re-breathed carbon dioxide, reduce package size and maximize reliability.
The present invention is a filter cartridge that reduces re-breathed carbon dioxide, minimizes package size and maximizes reliability. Accumulation of carbon dioxide in the filter cartridge is minimized by directing exhaled air out an exhalation valve and minimizing the effective dead space inside the filter cartridge. The package size is reduced by locating all inhalation and exhalation valves inside the filter cartridge thus eliminating the need to mount corresponding valves directly to a full face piece, half-mask, hood or any other type of breathing interface. Overall reliability is improved by fully enclosing all inhalation and exhalation valves, thereby protecting all valves from dust, dirt, impact or tampering.
The filter cartridge includes filtration media through which inhaled air is passed, a housing encasing the filtration media, a respiration port in the housing for passing filtered air and exhaled air to and from a breathing interface, an exhalation port in the housing for discharging exhaled air, an inhalation plate disposed between the filtration media and the respiration port, an inhalation check valve set in the inhalation plate, the inhalation check valve having an open state during inhalation and a closed state during exhalation, an exhalation check valve set in the exhalation port, the exhalation check valve having a closed state during inhalation and an open state during exhalation, whereby inhaled air is passed through and filtered by the filtration media, is then passed through the inhalation check valve in its open state, is blocked from the exhalation port by the exhalation valve in its closed state, and passed to the respiration port.
It should be noted that the filter cartridge envelopes the inhalation check valves, the filtration media and the respiratory pathway through which air passes within the filter cartridge. This feature clearly advances the art over filters that have exposed check valves subject to damage, tampering or degradation. An embodiment of the invention fully encases the check valves and filtration media with only the respiration port, exhalation port and the particulate filter housing externally exposed. By internalizing many of the mechanical components of protective respiratory devices into a single filter cartridge, reliability is increased while costs are reduced. In addition, by aggregating multiple mechanical functions common to respiratory devices into a single housing more efficient and rigorous testing may be done on future respiratory protective device designs.
The inventive design described and enabled herein provides improved usability for the wearer as carbon dioxide, heat and moisture are reduced. Improved usability and comfort are often directly related to the maximum amount of time a protective respiratory device is donned or engaged. Thus, by increasing the maximum amount of time the protective device is used, the overall safety of the user is enhanced.
Exhaled air is passed from the respiration port, blocked by the inhalation valve in its closed state, passed through the exhalation check valve in its open state and is then discharged out the exhalation port. The filter cartridge may have a plurality of inhalation check valves and a plurality of exhalation check valves. The check valves may be annular diaphragms or other construction as known in the art of check valve design.
A mount for fluidly coupling the filter cartridge to the breathing interface may be of various means including screw-threaded, bayonet, interference fit or the like. The filter may couple to any breathing interface including, but not limited to the following: hood, helmet, full face piece, half-mask, quarter-mask, mouthpiece and protective suit with integrated hood.
An advantage of the invention is that the inhalation valves prevent moisture, heat and carbon dioxide present in exhaled air from saturating and/or accumulating in the filtration media. Thus, the invention reduces the amount of moisture, heat and carbon dioxide that would otherwise be re-breathed absent the present design.
Another advantage of the invention is that the inhalation and exhalation check valves are protected from dust, direct impact and/or tampering.
Another advantage of the invention is that the overall size of the apparatus is reduced due to the integration of inhalation and exhalation valves inside the filter cartridge thus eliminating the need to mount corresponding valves directly to a full face piece, half-mask, hood or any other type of breathing interface.
Still another advantage of the present invention is that the collection of critical parts, namely, the exhalation valve, inhalation valve and filtration media may be collectively replaced with a single unit filter cartridge.
For a fuller understanding of the nature and objects of the invention, reference should be made to the following detailed description, taken in connection with the accompanying drawings, in which:
It will be seen that the objects set forth above, and those made apparent from the foregoing description, are efficiently attained and since certain changes may be made in the above construction without departing from the scope of the invention, it is intended that all matters contained in the foregoing description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.
It is also to be understood that the following claims are intended to cover all of the generic and specific features of the invention herein described, and all statements of the scope of the invention which, as a matter of language, might be said to fall therebetween. Now that the invention has been described,
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|Citing Patent||Filing date||Publication date||Applicant||Title|
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|U.S. Classification||128/201.25, 128/205.29, 128/206.17|
|International Classification||A62B18/08, A62B7/10|
|Mar 16, 2005||AS||Assignment|
Owner name: TMR-D, LLC, FLORIDA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:RESNICK, TODD A;STEIN, RICHARD L;REEL/FRAME:015783/0490;SIGNING DATES FROM 20050314 TO 20050315
|Jan 8, 2008||AS||Assignment|
Owner name: TMR-E, LLC, FLORIDA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TMR-D, LLC;REEL/FRAME:020325/0491
Effective date: 20071219
|May 10, 2010||REMI||Maintenance fee reminder mailed|
|Oct 3, 2010||LAPS||Lapse for failure to pay maintenance fees|
|Nov 23, 2010||FP||Expired due to failure to pay maintenance fee|
Effective date: 20101003